參數(shù)資料
型號(hào)： TPS40022PWPR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.01 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： POWERPAD, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 3/29頁(yè)
文件大小： 337K
代理商： TPS40022PWPR
TPS40020
TPS40021
TPS40022
SLUS535 – MARCH 2003
www.ti.com
11
APPLICATION INFORMATION
Figure 4 shows the behavior of key signals during initial startup, during a fault and a successfully fault recovery.
At time t0, power is applied to the converter. The voltage on the soft-start capacitor (VCSS) begins to ramp up
and acts as the reference until it passes the internal reference voltage plus about one diode drop – t1. At this
point the soft-start period is over and the converter is regulating its output at the desired voltage level. From
t0 to t1, pulse-by-pulse current limiting was in effect, and from t1 onward, overcurrent pulses are counted for
purposes of determining if a fault exists. At t2, a heavy overload is applied to the converter. This overload is
in excess of the overcurrent threshold, the converter starts limiting current and the output voltage falls to some
level depending on the overload applied. During the period from t2 to t3, the counter is counting overcurrent
pulses and at time t3 reaches a full count of 7. The soft-start capacitor is then discharged, the outputs are
disabled, the counter decremented, and a fault condition is declared.
VCSS
VOUT
ILOAD
UDG–01144
t
t0
t1
t2 t3
t10
0
6
5
4
3
2
1
0
t4
t5
t6
t7
t8
t9
1
2
3
4
5
6
7
0.7 V
FAULT
Figure 4. Overcurrent/Fault Waveforms
When the soft-start capacitor is fully discharged, it begins charging again at the same rate that it does on startup,
with a nominal 3-
A current source. As the capacitor voltage reaches full charge, it is discharged again and the
counter is decremented by one count. These transitions occur at t3 through t9. At t9, the counter has been
decremented to zero. Now the fault logic is cleared, the outputs are enabled and the converter attempts to
restart with a full soft-start cycle. The converter comes into regulation at t10.
Setting the Current Limit
Connecting a resistor from VDD to ILIM sets the current limit. A current sink in the chip causes a voltage drop
across the resistor connected to ILIM. This voltage drop is the overcurrent threshold for the part. The current
that the ILIM pin sinks is dependent on the value of the resistor connected to RT and is given by:
I
ILIM + 19.0
0.7 V
R
T
The tolerance of the current sink is too loose to do an accurate current limit. The main purpose is for hard fault
protection of the power switches. Given the tolerance of the ILIM sink current, and the RDS(on) range for a
MOSFET, it is generally possible to apply a load that thermally damages the converter. This device is intended
for embedded converters where load characteristics are defined and can be controlled.
(1)
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